ELP 1mp Hd Metal Case Mini Usb Camera Webcam with 3.6mm Wide Angle Lens for Building or Industrial Video Security Metal case mini USB Camera for directly use at house or machine vision 1 megapixel with HD resolution up to 1080x720P USB2.0 Por for fast, smoother, convenient compatible for all kinds of device Super small outline and thin profile for embedded applications Cost-effective,User don't need any DVR. Only a few USB cameras and a computer can make a surveillance system to keep your house security.